72 340 engine

Its not bad, how happy are you with the performance? The intake does very little, its the overall set up. Sure going from a 2bbl to a 4bbl sure helps but it has a 4bbl right now. Switching to say Edelbrock RPM intake will pick it up around 15 hp or about 2 car lengths farther ahead in the 1/4 mile...3 car lengths max I would expect. A carb swap might give you more gain, the old Carter afb on it right now is a nice carb but a new Edelbrock AVS tuned right would pick it up at least 15--20 hp. Or a Holley DP but I like Carter/Edelbrock for the street--motor seems to idle better--I run dual 500 Carters on my 340, Got a old rare Edelbrock intake.

One thing about that 1970 intake is those holes under the carb, if you put a 750 Holley on it, the front holes are a tad too small and you need a 1/4 spacer to raise the carb up. Aftermaket intakes don't have those 4 holes, just wide openings so heck a Holley 850 would bolt right on with no spacer needed